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annotate geotemco/lib/simile/ajax/scripts/xmlhttp.js @ 0:b12c99b7c3f0

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commit for previous development
author Zoe Hong <zhong@mpiwg-berlin.mpg.de>
date Mon, 19 Jan 2015 17:13:49 +0100
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1 /**
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2 * @fileOverview XmlHttp utility functions
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3 * @name SimileAjax.XmlHttp
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4 */
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5
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6 SimileAjax.XmlHttp = new Object();
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7
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8 /**
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9 * Callback for XMLHttp onRequestStateChange.
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10 */
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11 SimileAjax.XmlHttp._onReadyStateChange = function(xmlhttp, fError, fDone) {
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12 switch (xmlhttp.readyState) {
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13 // 1: Request not yet made
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14 // 2: Contact established with server but nothing downloaded yet
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15 // 3: Called multiple while downloading in progress
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16
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17 // Download complete
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18 case 4:
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19 try {
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20 if (xmlhttp.status == 0 // file:// urls, works on Firefox
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21 || xmlhttp.status == 200 // http:// urls
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22 ) {
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23 if (fDone) {
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24 fDone(xmlhttp);
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25 }
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26 } else {
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27 if (fError) {
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28 fError(
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29 xmlhttp.statusText,
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30 xmlhttp.status,
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31 xmlhttp
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32 );
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33 }
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34 }
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35 } catch (e) {
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36 SimileAjax.Debug.exception("XmlHttp: Error handling onReadyStateChange", e);
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37 }
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38 break;
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39 }
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40 };
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41
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42 /**
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43 * Creates an XMLHttpRequest object. On the first run, this
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44 * function creates a platform-specific function for
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45 * instantiating an XMLHttpRequest object and then replaces
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46 * itself with that function.
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47 */
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48 SimileAjax.XmlHttp._createRequest = function() {
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49 if (SimileAjax.Platform.browser.isIE) {
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50 var programIDs = [
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51 "Msxml2.XMLHTTP",
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52 "Microsoft.XMLHTTP",
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53 "Msxml2.XMLHTTP.4.0"
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54 ];
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55 for (var i = 0; i < programIDs.length; i++) {
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56 try {
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57 var programID = programIDs[i];
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58 var f = function() {
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59 return new ActiveXObject(programID);
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60 };
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61 var o = f();
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62
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63 // We are replacing the SimileAjax._createXmlHttpRequest
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64 // function with this inner function as we've
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65 // found out that it works. This is so that we
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66 // don't have to do all the testing over again
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67 // on subsequent calls.
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68 SimileAjax.XmlHttp._createRequest = f;
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69
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70 return o;
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71 } catch (e) {
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72 // silent
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73 }
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74 }
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75 // fall through to try new XMLHttpRequest();
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76 }
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77
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78 try {
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79 var f = function() {
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80 return new XMLHttpRequest();
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81 };
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82 var o = f();
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83
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84 // We are replacing the SimileAjax._createXmlHttpRequest
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85 // function with this inner function as we've
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86 // found out that it works. This is so that we
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87 // don't have to do all the testing over again
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88 // on subsequent calls.
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89 SimileAjax.XmlHttp._createRequest = f;
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90
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91 return o;
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92 } catch (e) {
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93 throw new Error("Failed to create an XMLHttpRequest object");
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94 }
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95 };
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96
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97 /**
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98 * Performs an asynchronous HTTP GET.
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99 *
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100 * @param {Function} fError a function of the form
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101 function(statusText, statusCode, xmlhttp)
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102 * @param {Function} fDone a function of the form function(xmlhttp)
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103 */
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104 SimileAjax.XmlHttp.get = function(url, fError, fDone) {
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105 var xmlhttp = SimileAjax.XmlHttp._createRequest();
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106
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107 xmlhttp.open("GET", url, true);
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108 xmlhttp.onreadystatechange = function() {
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109 SimileAjax.XmlHttp._onReadyStateChange(xmlhttp, fError, fDone);
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110 };
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111 xmlhttp.send(null);
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112 };
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113
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114 /**
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115 * Performs an asynchronous HTTP POST.
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116 *
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117 * @param {Function} fError a function of the form
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118 function(statusText, statusCode, xmlhttp)
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119 * @param {Function} fDone a function of the form function(xmlhttp)
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120 */
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121 SimileAjax.XmlHttp.post = function(url, body, fError, fDone) {
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122 var xmlhttp = SimileAjax.XmlHttp._createRequest();
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123
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124 xmlhttp.open("POST", url, true);
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125 xmlhttp.onreadystatechange = function() {
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126 SimileAjax.XmlHttp._onReadyStateChange(xmlhttp, fError, fDone);
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127 };
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128 xmlhttp.send(body);
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129 };
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130
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131 SimileAjax.XmlHttp._forceXML = function(xmlhttp) {
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132 try {
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133 xmlhttp.overrideMimeType("text/xml");
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134 } catch (e) {
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135 xmlhttp.setrequestheader("Content-Type", "text/xml");
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136 }
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137 };